Volume 1, Issue 6
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645


Summary and Conclusions

  • 1.  Feces from healthy human donors were inoculated with varying doses of (2 strains) or (2 strains) and the survival of the organisms during storage in closed containers at 15°–25°C. was determined. An appreciable proportion of the number introduced could be recovered in all trials after 2 days, frequently after 5–7 days, sometimes even after 14 days.
  • 2.  Adult which had been starved for a week were allowed to feed on uninfected human feces; the quantity ingested in a single meal was estimated to be approximately 0.02–0.1 gram.
  • 3.  Similarly starved were allowed to feed on human feces to which varying numbers of had been recently added; after an interval of 2 or 7 days, the alimentary tracts were removed and cultured for the presence of these organisms. Survival in the gut was demonstrated to occur fairly regularly and to persist for at least 7 days when the insects had ingested in feces approximately 10 or more viable (strain 5609) or (strain B-33). With smaller doses, recovery of the fed was obtained only rarely. The limited data obtained with a second strain of (5327) suggested that it had somewhat less ability to persist than strain B-33.
  • 4.  Although the cockroach appears to have some mechanism for eliminating many hundreds of ingested , if the insect eats feces containing at least several thousand of these microorganisms it may thereafter continue to harbor certain strains for at least a week.


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